Spot bitcoin ETFs began trading a year ago, opening up the crypto market to a wider range of investors and paving the way for more such products.

A year after they began trading, there was a clear winner among spot bitcoin exchange-traded funds. BlackRock's Bitcoin Trust saw investors pour in billions while Grayscale's Bitcoin Trust lagged behind after massive outflows.

There are four U.S. spot Bitcoin exchange-traded funds among top 20 launches of all time a year after their debut